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LEDs (light-emitting diodes) are rectifying semiconductor devices that convert electrical energy into electromagnetic radiation. You can use these devices to create a 3-dimensional light display. LED cubes require some care and good soldering skills…

An oscilloscope is a device that allows you to see an electronic signal so that it appears as a waveform. Traditional oscilloscopes work by amplifying a signal to control the position of a dot on the y-axis (vertical axis) of a cathode-ray tube…

This is a working alarm. It uses a laser beam that bounces between mirrors attached to two walls that face each other. The figure to the right has been digitally edited to show the path of the beam. When the beam is broken, a buzzer sounds.This…

This project allows you to use electromagnetic levitation to suspend a globe of the world above a surface. The "globe" is actually a table tennis ball painted to look like a globe. Keeping it in place requires careful control of electrical current…

A pulse generator circuit is an important building block for many electronic projects, such as the heart of a digital clock. Its purpose is basically to switch an output on and off for as long as the circuit is activated. Sometimes, these circuits…

A theremin is a musical instrument developed in the 1920s by the Russian inventor, Léon Theremin. It was one of the world's first electronic musical instruments. The original invention used radio-frequency electronics and a pair of antennae. By…

White noise is a smooth hiss consisting of all audio frequencies played back at random simultaneously. Because your ears cannot "lock" onto any specific frequencies or patterns in white noise, this device has the effect of shutting off your ears to…

Everything in the universe is in motion. One basic, yet important, type of motion is constant-speed motion. This project takes you through assembly of a model battery-powered vehicle that moves at a constant speed. This particular vehicle is built…